Why using wrappers for D?
Mike Wey via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Mon Oct 3 11:18:44 PDT 2016
On 10/03/2016 07:19 PM, Chalix wrote:
> On Monday, 3 October 2016 at 13:51:28 UTC, Mike Parker wrote:
>> // wrapfoo.d
>> import foo; // import the foo module from above
>> void myFunc(string s)
>> import std.string : toStringz;
> Thank you for the example, Mike!
> And thanks to all others who support me with their answers! I didn't
> expect so much answers, the D community seems to be very helpful :)
> But there still is one thing, which I don't get:
> If I "import foo;" in my project, it will be compiled alongside. So
> there is no need for an extra library. Same should be for wrapfoo.d. If
> I "import wrapfoo;", I should just need the C-library "foo", and no
> D-library "food" right?
> To have a more practical example, I looked up the "header" of the GtkD
> gtk/Main.d file. There are functions exactly like you described:
>> public static void init(ref string argv)
>> int argc = cast(int)argv.length;
>> char** outargv = Str.toStringzArray(argv);
>> gtk_init(&argc, &outargv);
>> argv = Str.toStringArray(outargv, argc);
> This function wraps the C-like gtk_init function to a D init function.
> The gtk_init function is the function from the GTK+ library, which is
> loaded in the gtkc/gtk.d file:
>> Linker.link(gtk_init, "gtk_init", LIBRARY.GTK);
> Linker and link are defined in the gtkc/Loader.d
> So, why is it not enough just to "import gtk.Main"? What kind of code is
> inside the gtkd-3 library?
The gtkd-3 library contains for example the code you quoted above.
More information about the Digitalmars-d-learn